Oil seal



Nov. 14, 1944. H. NoR'rHUP 2,362,343

OIL SEAL Filed Dec. 22, 1938 INVENTOR,

ATTORNEYS.

Patented Nov. 14, 1944 OIL SEAL Harry L. Northup, Chicago, lil.,assignor to Chicago Rawhide Manufacturing Company, Chicago, III., acorporation of Illinois Application December 22, 1938, Serial No.247,154

4 Claims.

This invention relates to oil seals of the type in which the packingmember is a narrow somewhat conical band of flexible material which issecured to the casing of the seal by having its larger end sleeved overa reentrant flange on the casing in tightly clamped engagement with theflange.

The principal purpose of the invention is to provide an improved seal ofthe type described which can be manufactured at comparatively smallcost, is strong and durable in construction, and will serve effectivelyto prevent any leakage of oil.

-Other more specific objects and advantages of the invention will beapparent to those skilled in the art upon a full understanding of theconstruction, arrangement and function of the parts which have beencombined to form the seal.

Several different embodiments of the invention are presented herein forthe purpose of exempliflcation, but it will of course be appreciatedthat the invention is susceptible of incorporation in still otherstructurally modified forms coming equally within the scope of theappended claims.

In the accompanying drawing:

Fig. 1 is a diagrammatic section through a seal constructed inaccordance with the invention, showing the seal positioned in a housingabout a shaft;

Fig. 2 is a partially sectioned end view of the same seal; and

Figs. 3 to 9 inclusive are radial sections through several otherstructurally modified seals which are also constructed in accordancewith the invention.

.The seal shown in Figs. 1 and 2 will first be described. This seal iscomposed of a centrally apertured sheet metal cup I0, a packing memberII of leather, synthetic rubber or other suitable material, in the formof a narrow somewhat conical band, an endless coil spring I2, and twoclamping members I3 and I4, the member I3 being a sheet metal ring ofchanneled radial section with an outer flange I5 and an inner flange I6,and the member I4 being a centrally aperturedsheet metal ring ofL-shaped radial section with an inturned outer ange I1.

The cup ID provides a cage-like casing for the other parts of the seal.This casing is characterized by a cylindrical outer wall I8 for pressfltengagement within a housing I9 through which a shaft 20 extends, an endwall 2I which extends radially inward from one end of the outer Wall I8to a point adjacent the shaft 20, and a small reentrant flange 22 whichextends axially from the inner edge of the end wall 2| back into theinterior of the casing.

The large diameter end 23 of the tubular packing member II is sleevedover the reentrant iiange 22 on the inside of the casing, and theclamping ring I3 is positioned against the end Wall 2l of the casingwith its outer flange I5 bearing against the outer wall of the casingand its inner flange I6 clamped against the large diameter end 23 of thepacking member in directly opposed relation to the reentrant flange 22on the casing. The two flanges I6 and 22 are clamped tightly against theend 23 of the packing member and converge somewhat toward their edges,whereby to lock the interposed end 23 securely in place. The extremeedge of the flange I6 is preferably provided with a plurality of neclosely arranged teeth-like projections 24 which are embedded in theouter surface of the packing member, while the extreme edge of theflange 22 is preferably turned outwardly a little into more tightlycompressed engagement with the main surface of the packing member. Theflange I5 of the clamping ring I3 may be so dimensioned as to wedgetightly against the inside surface of the outer wall I8 of the casing,whereby to reinforce the casing radially at that point, but this flangeand also the adjacent outer portion of the clamping ring may be entirelyeliminated if desired.

The small diameter end 25 of the packing member is designed forrelatively rotatable but oil-tight engagement with the periphery of theshaft 20, and is encircled by the spring I2, which spring serves toresiliently construct the packing about the shaft.

The clamping ring I4 serves to hold the clamping ring I3 in position,and also serves to hold the spring I2 in position. The ring I4 ispreferably of such size as to just fit within the outer wall IB of thecasing, flush with the edge of the wall III, and is characterized by anend wall 2B and the previously described inturned flange I'I. The flangeIl extends from the outer edge of the end wall 26 to a point wellinwardly of the outer edge of the clamping ring I3. The end wall 26holds the spring I2 in place, while the edge of the inturned flange I'Iholds the ring i3 in place. The ring I4 is clamped tightly against thering I3 and is permanently held in that position by a small inturnededge 21 on the outer wall I8 of the casing.

In securing the packing member to the reentrant iiange 22 the latter maybe forced outwardly at its free edge by any suitable expansion means,and may also be indented or offset a little at intervals whereby to lockthe packing member securely against any possibility of rotation.

The seal shown in Fig. 3--like the flrst described seal-includes acasing 29 which is provided with a reentrant flange 30, and a tubularpacking member 3l which has its large diameter end 32 sleeved over thereentrant flange 30. In this seal the end 32 of the packing member isclamped against the reentrant flange 3Il of the casing by means of aclamping ring 33 which has a small radially extending flange 34 at itsouter edge and a small axially extending flange 35 at its inner edge.The flanges 34 and 35 are connected together by an intervening section36 which extends diagonally between the two flanges and is preferablycurved to provide ample space for the accommodation of the spring 31.The flange 35 on the ring 33 cooperates with the reentrant flange 30 inthe casing to secure the packing member in place. The ring 33 is held inplace by means of a. clamping washer 38 which engages with the foot-likeflange 34 on the ring 33. 1f desired, the flange 34 on the ring 33 maybe omitted. Also, the diagonally extending section 36 of the ring 33,instead of being dished, can be made conical or given some other shapewhich will not interfere with the spring 31.

The seal shown in Fig. 4 differs from the one shown in Fig. 3 in thatthe clamping ring 'which engages with the large diameter end of thepacking is of a different shape. Instead of being provided with a flangeopposite the reentrant flange 39 on the casing, the clamping ring 40 isoffset at its inner edge away from the end wall 4| of the casing andextends radially inward into sharply localized clamping engagement withthe large diameter end 42 of the packing at a point spaced from the endwall of the casing.

The seal shown in Fig. differs from those shown in Figs. 3 and 4 in thatthe clamping ring 43 is provided with a reentrant flange 44 opposite thereentrant ange 45 on the casing, and the large diameter end 46 of thepacking is securely gripped between these two reentrant flanges, both ofwhich extend in the same general direction. In this particular seal thereentrant flanges 44 and 45 are both somewhat conical in shape, with theresult that when the clamping ring 43 is forced axially into the casingabout the packing it will become tightly wedged against the latter andin its flnal position may be spaced somewhat from the end Wall 31 of thecasing.

The seal shown in Fig. 6 contains a clamping ring 48 which ischaracterized by a large diameter end 49, a small diamrter end 5D and anouttumed flange 5l. The end 49 of the clamping ring is engaged underpressure by a closure washer 52, while the end 50 of the clamping ringembraces the large diameter end 53 of the packlng. The outturned flange5I provides a strutlike radial reinforcement for the small diameter end50 of the clamping ring.

In the seal of Fig. '7 the closure washer used in the previouslydescribed seals is eliminated and the clamping ring 54 is provided withinturned flanges 55 and 56 at both of its ends. The flange 55 grips thepacking and is preferably beveled a little in order to pinch the latterinto the form of a small locking bead at its large diameter end, whilethe flange 56 retains the spring in place on the free lip of thepacking.

In the seals shown in Figs. 8 and 9 the packing members are moulded fromsynthetic rubber or other suitable material and are specially shaped toconform to the portions of the reentrant flanges and clamping ringsbetween which they are held. There are no springs in these particularseals, but 1t will of course be appreciated that springs of any sort canbe included, end closures for the casings being added if needed toretain such springs in position. While springs .have been shown inconnection with all of the above described embodiments of the invention,it will of course be appreciated that the springs could be omitted, andthat the end closure washers could also be omitted in thoseconstructions wherein the clamping ring can be engaged directly by aninturned edge on the end of the outer wall of the casing.

In the seal of Fig. 8, the small diameter end 51 of the clamping ring 58engages with the outer surface of the packing 59 and may beadvantageously confined within a backing rib 60 formed on the inside ofthe end wall of the casing, while the reentrant flange Bi on the casingis preferably curved outwardly into a small groove 62 formed in theinner surface of the packing, thereby securely locking the packing inpostion.

In the seal of Fig. 9 the reentrant flange 53 on the casing is disposedat an inclination to the axis of the seal and the large diameter end B4of the packing is clamped against this flange and also against the endwall 65 of the casing by a clamping ring 66, which clamping ring has achannel portion 61 which conforms with a bead E8 provided on the largediameter end B4 of the packing.

In applying the invention to external seals, that is, seals in which thecasing is fixedly secured to the shaft and the packing member is locatedat the outer periphery of the seal for relatively rotatable coactionwith the surrounding machine part, the parts in each of the abovedescribed seals will of course be reversed radially, with the reentrantflange of the easing located at the outside instead of at the inside ofthe casing.

I claim:

l. A self-contained sealing unit of the type described, comprising acentrally apertured sheet metal cup for pressed fit insertion within ahousing about a centrally located shaft, which cup is provided about theaperture in the bottom thereof with an integrally formed reentrantflange, a narrow somewhat conical band of flexible packing material, oneedge of which is slightly larger than the other and is sleeved over thereentrant flange, an axially opening annular channel member which opensaxially of the cup in the direction of projection of said reentrantflange and which is positioned against the bottom of the cup between therim of the latter and the larger edge of the band of packing material inradially clamped engagement with such edge, and a second cup which isprovided with a rim having an edge of substantially reduced diameterpositioned within the channel member in axially clamped engagement withthe bottom of the latter.

2. A self-contained sealing unit of the type described, comprising acentrally apertured sheet metal cup for pressed Ilt insertion within ahousing about a centrally located shaft, which cup is provided about theaperture in the bottom thereof with an integrally formed reentrantflange, a narrow somewhat conical band of flexible packing material, oneedge of which is slightly larger than the other end is sleeved over thereentrant flange, an axially opening annular channel member which opensaxially of the cup in the direction of projection of said reentrantflange and is characterized by inner and outer marginal flanges. saidchannel member being positioned adjacent the bottom of the cup with theouter marginal ilange of the channel member in engagement with the rimof the cup and the inner marginal flange of the channel member inradially clamped engagement with the larger edge of the band of packingmaterial, outwardly of said reentrant flange, and a second cup which isprovided with a rim having an edge of substantially reduced diameterpositioned within the channel a rim having an edge ci substantiallyreduced diameter positioned within the channel member inwardly of saidouter marginal flange in axially clamped engagement with the bottom oithe channel member, said reentrant and inner marginal ilanges convergingtoward each other ln their direction of projection in gripping thelarger edge of the band between them, with said reentrant angeincreasing in diameter in said direction and said inner marginal flangedecreasing in diameter in the same direction.

4. A self-contained sealing unit of the type described, comprising acentrally apertured sheet metal cup for pressed llt insertion within ahousmember inwardly of said outer marginal flange ing about a centrallylocated shaft, which cup is in axially clamped engagement with thebottom provided about the aperture in the bottom thereof the channelmember, said reentrant and inner of with an integrally formed reentrantilange, a marginal anges converging towad each other in narrow somewhatconical band of ilexible packtheir direction of projection in grippingthe ing material, one edge of which is slightly larger larger edge ofthe band between them. than the other and is sleeved over the reentrant3. A self-contained sealing unit of the type flange, an axially openingannular channel memdescribed, comprising a centrally apertured sheet berwhich opens axially of the cup in the direcmetal cup for pressed lltinsertion Within a houstion of projection of said reentrant flange andis ing about a centrally located shaft. which cup is characterized byinner and outer marginal provided about the aperture in the bottomthereflanges, said channel member being positioned oi with an integrallyformed reentrant flange, a adjacent the bottom of the cup with the outernarrow somewhat conical band of ilexible packing marginal ilange of thechannel member in enrnaterial, one edge of which is slightly larger thangagement with the rim of the cup and the inner the other and is sleevedover the reentrant flange, marginal ilange of the channel member inradian axially opening annular channel member ally clamped engagementwith the larger edge of which opens axially of the cup in the directionof the band of packing material, outwardly of said projection of saidreentrant flange and is charreentrant flange, and an annular memberwhich acterized by inner and outer marginal flanges, engages with theinside of the rim of the cup said channel member being positionedadjacent adjacent the edge of the latter and is provided the bottom ofthe cup with the outer marginal adjacent the channel member with aportion of flange of the channel member in engagement substantiallyreduced diameter, which portion is with the rim of the cup and the innermarginal positioned within the channel member inwardly flange of thechannel member in radially clamped of the outer marginal flange of thelatter in engagement with the larger edge of the band of axially clampedengagement with the bottom of packing material, outwardly of saidreentrant the channel member.

flange, and a second cup which is provided with HARRY L. NORTHUP.

CERTIFICATE OF CORRECTION.

Patent No. 2,562,815.

November lli 19ml maar L. NoRrfrUP.

It is hereby certified that error appears in the printed specificationofthe above numbered patent requiring correction as follows: Page 1,second column, line 56, for the word "cotnnsltr'uci'.'l read -constrict;page 2, first column, 1ine55, for the numeral "57" read ll'?--; page,first column, line 1B, claim 2, for "towed" read toward; and that thesaid Letters Patent should be read with this correction therein that thesame may conform to the record of the case in the Patent Office.

Signed and sealed this 15th day of February, A. D. 1915.

Leslie Frazer (Seal) Acting Commissioner of Patents.

flange, an axially opening annular channel member which opens axially ofthe cup in the direction of projection of said reentrant flange and ischaracterized by inner and outer marginal flanges. said channel memberbeing positioned adjacent the bottom of the cup with the outer marginalilange of the channel member in engagement with the rim of the cup andthe inner marginal flange of the channel member in radially clampedengagement with the larger edge of the band of packing material,outwardly of said reentrant flange, and a second cup which is providedwith a rim having an edge of substantially reduced diameter positionedwithin the channel a rim having an edge ci substantially reduceddiameter positioned within the channel member inwardly of said outermarginal flange in axially clamped engagement with the bottom oi thechannel member, said reentrant and inner marginal ilanges convergingtoward each other ln their direction of projection in gripping thelarger edge of the band between them, with said reentrant angeincreasing in diameter in said direction and said inner marginal flangedecreasing in diameter in the same direction.

4. A self-contained sealing unit of the type described, comprising acentrally apertured sheet metal cup for pressed llt insertion within ahousmember inwardly of said outer marginal flange ing about a centrallylocated shaft, which cup is in axially clamped engagement with thebottom provided about the aperture in the bottom thereof the channelmember, said reentrant and inner of with an integrally formed reentrantilange, a marginal anges converging towad each other in narrow somewhatconical band of ilexible packtheir direction of projection in grippingthe ing material, one edge of which is slightly larger larger edge ofthe band between them. than the other and is sleeved over the reentrant3. A self-contained sealing unit of the type flange, an axially openingannular channel memdescribed, comprising a centrally apertured sheet berwhich opens axially of the cup in the direcmetal cup for pressed lltinsertion Within a houstion of projection of said reentrant flange andis ing about a centrally located shaft. which cup is characterized byinner and outer marginal provided about the aperture in the bottomthereflanges, said channel member being positioned oi with an integrallyformed reentrant flange, a adjacent the bottom of the cup with the outernarrow somewhat conical band of ilexible packing marginal ilange of thechannel member in enrnaterial, one edge of which is slightly larger thangagement with the rim of the cup and the inner the other and is sleevedover the reentrant flange, marginal ilange of the channel member inradian axially opening annular channel member ally clamped engagementwith the larger edge of which opens axially of the cup in the directionof the band of packing material, outwardly of said projection of saidreentrant flange and is charreentrant flange, and an annular memberwhich acterized by inner and outer marginal flanges, engages with theinside of the rim of the cup said channel member being positionedadjacent adjacent the edge of the latter and is provided the bottom ofthe cup with the outer marginal adjacent the channel member with aportion of flange of the channel member in engagement substantiallyreduced diameter, which portion is with the rim of the cup and the innermarginal positioned within the channel member inwardly flange of thechannel member in radially clamped of the outer marginal flange of thelatter in engagement with the larger edge of the band of axially clampedengagement with the bottom of packing material, outwardly of saidreentrant the channel member.

flange, and a second cup which is provided with HARRY L. NORTHUP.

CERTIFICATE OF CORRECTION.

Patent No. 2,562,815.

November lli 19ml maar L. NoRrfrUP.

It is hereby certified that error appears in the printed specificationofthe above numbered patent requiring correction as follows: Page 1,second column, line 56, for the word "cotnnsltr'uci'.'l read -constrict;page 2, first column, 1ine55, for the numeral "57" read ll'?--; page,first column, line 1B, claim 2, for "towed" read toward; and that thesaid Letters Patent should be read with this correction therein that thesame may conform to the record of the case in the Patent Office.

Signed and sealed this 15th day of February, A. D. 1915.

Leslie Frazer (Seal) Acting Commissioner of Patents.

